I would think so...I'm no expert on these things but it really does appear that today's Sandy Bridge CPUs are leaps and bounds ahead of anything from 4 years ago, including these low voltage chips--hell the 1.7Ghz i5 on the Air trounces the 3509 Geekbench score of my C2D 2.53Ghz Mid 2009 MBP with a 5860--that even surpasses the 2.67Ghz core i7 in the 2010 MBPs....
I think you should expect a massive improvement....